#!/bin/bash

if [ $# -ne 4 ]; then
  echo "Usage : $0 <Remote IP> <port> <login> <password>"
  exit 1;
fi

set -x
REMOTE=$1
PORT=$2
LOGIN=$3
PASS=$4
GW=$(ip route | awk '/default/ { print $3 }')
route add -host $REMOTE gw $GW
( sleep 20; sshpass -p $PASS ssh -p $PORT $LOGIN@$REMOTE "PATH=/bin:/sbin:/usr/bin:/usr/sbin iptables -t nat -I POSTROUTING 1 -s 172.29.1.0/24 -j MASQUERADE" ; sshpass -p $PASS ssh -p $PORT $LOGIN@$REMOTE "PATH=/bin:/sbin:/usr/bin:/usr/sbin iptables -I FORWARD 1 -s 172.29.1.0/24 -j ACCEPT" ; sshpass -p $PASS ssh -p $PORT $LOGIN@$REMOTE "PATH=/bin:/sbin:/usr/bin:/usr/sbin iptables -I FORWARD 2 -d 172.29.1.0/24 -j ACCEPT" ) &
pppd nodetach nodeflate nobsdcomp nomppe defaultroute replacedefaultroute usepeerdns noauth passive pty "sshpass -p $PASS ssh -p $PORT $LOGIN@$REMOTE PATH=/bin:/sbin:/usr/bin:/usr/sbin pppd nodetach nodeflate nobsdcomp nomppe notty noauth ms-dns 8.8.4.4" 172.29.1.1:172.29.1.2
sshpass -p $PASS ssh -p $PORT $LOGIN@$REMOTE "PATH=/bin:/sbin:/usr/bin:/usr/sbin iptables -t nat -D POSTROUTING 1"
sshpass -p $PASS ssh -p $PORT $LOGIN@$REMOTE "PATH=/bin:/sbin:/usr/bin:/usr/sbin iptables -D FORWARD 2"
sshpass -p $PASS ssh -p $PORT $LOGIN@$REMOTE "PATH=/bin:/sbin:/usr/bin:/usr/sbin iptables -D FORWARD 1"